Sound-producing instrument



May 29,1928.- 1,671,863

A. HERSCHEL SOUND PRODUCING INSTRUMENT Filed Sept. 25, 1925 za /7 E IN VE/V To? WI IV E5356 d pr n f A T TOR/YE) Patented May 29, 1928.

UNITED STATES ALFRED HEBSCHEL, 01 NEW YORK, N. Y.

SOUND-PRODUCING INSTRUMENT Application filed September 25, 1925. Serial No. 58,627.

This invention relates to improvements in sound producing instruments and has particularly reference to a loud speaker for use in connection with radio receiving apparatus.

The principal object of the invention resides in a loud speaker of the cone type 111 which the sound is produced with greater clarity and strength than those heretofore constructed as the concave surface of the playing cone is exposed directly to the atmosphere, while any vibrations-which may penetrate the convexed side of the cone are trapped and directed forwardly with the vibrations of the playing cone.

Another object of the invention is the provision of a loud speaker inwhich the amplifying cone is flexibly supported at its outer periphery within a second cone or casing so that the full qualities of the amplifying cone are utilized.

A further object of the invention is to provide a loud speaker which is simple in construction, inexpensive of manufacture and highly efficient for the purpose intended.

\Vith these and other objects inview, the invention resides in certain novel construction and combination and arrangement of parts. the essential features of which are hereinafter fully described, are particularly pointed out in the appended claims, and are illustrated in the accompanying drawing, in which Figure 1 is a side elevation of my improved loud speaker.

Figure 2 is a vertical longitudinal sec-' tional view theiethrough.

Figure 3 is a sectional view showing a slight modified form.

Referring more particularly to the drawing, the reference numeral 10 designates my improved loud speaker in its entirety and which includes a base 11 to which one end of a vertically extending post or standard 12 is threadedly connected. The post is hollow or tubular for the passage of wires to be presently described. The other end of the post or standard is threadedly connected to a hollow globular shaped head 13, which supports a conical shaped casing 14. The casing 14 may be constructed of any suitable material such as metal, fiber board or parchment, and the narrow or pointed end of the casing extends through an opening 15 in the head and is secured therein in any suitable manner. A wall 16 is mounted in the re strictedend of the casing and supports an electric sound producing unit 17 A shaft 18 extends from the unit through the head to the exterior of the same, so that the armature in the unit may be adjusted to prevent the locking of the same to overcome any 'possibility of distortion in the instrument.

Supported within the casing 14' is a cone shaped diaphram or amplifying cone 19, the apex of which is provided with an aperture 20 through which the vibrating pin 21 of the unit 17 extends. A pair of disks 22 are mounted on the pin and engage opposite sides of the cone, while a nut or other retaining member 23 is threaded to the free end of the pin.

The amplifying cone 19 is spaced from the walls of the casing to provide a chamber 25 and the said cone is constructed of parchment and has its outer peripheral edges loosely engaging the inner walls of the casing, so that the cone 19 is free to vibrate. If desired, the edges of the casing and cone may be bound With a braid for imparting a finished appearance to the device but the braid must have yielding qualities to allow the cone to vibrate; TVires 24 connect the device with the radio receiving set and extend through the base 11, post 12, and head 13 to the binding posts on the unit 17.

In practice, We shall presume that the device is connected with a radio receiving outfit and at which time the electrical impulses will be transferred into sound impulses through the unit 17'. As the pin 21 vibrates, the impulses are transferred to the cone 19 from Where they are amplified and emitted outwardly to the atmosphere from the concave side thereof. It is, of course, understood that sound emitted from a concave surface is greater than from a convexed surface but it is'possible that a certain amount of sound waves may penetrate the parchment to the concave side of the cone. These waves are stopped or trapped within the chamber 25 and strike against the concave side of the'casing from where they are projected forward in the same direction as thosefront the concave side of the cone 19. It will therefore be seen that the sound produced by the device is concentrated and thrown in one direction, so that a clear and better tone is produced.

In Figure 3 of the drawing, I have shown a sh htly modified form of casing 14 which is o? a different shape than the casing 14; shown in the preferred form. The is mainder of the parts are identical with those shown in the preferred form and it will be appreciated that the casing if desired may be of various other shapes without in any way departing from the spirit of my invention.

What is claimed as new is 1. A loud speaker comprising a base member, a hollow head supported above said base, a conical shaped casing having its apex extending-into said hollow head and supported thereby, said casing adapted to contain an electrical sound producing instrument, and a cone shaved diaphragm supported by said sound producing instrument and disposed within said casing with its free edge loosely disposed therein.

2. A loud speaker comprising a base member, a casing supported by said base member and adapted to contain an electrical sound producing instrument, and a cone shaped diaphragm supported by said sound producing instrument and disposed within said casing with its free edge loosely disposed therein.

In testimony whereof I have afiixed my signature.

ALFRED HERSCHEL. 

